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Jan. 16, 1923.

Patented Jan. 16, 1923.`

UNITED STATES PATENT OFFICE..y

WILLIAM R. HURD, 2D, OF BEVERLY, MASSACHUSETTS, ASSIGNOR TO UNITED SHOEMACHINERY CORPORATION, 0F PATTERSON,v NEW JERSEY, A. CORPORATION-OI:`NEW JERSEY.

MANUFACTURE OF TOOLS.

Original application led March 11, 1918, Serial No. i 1920. Serial Toall whom t may concern: Y

y Be it known that I, WILLIAM R. HURD, 2d, a citizen of the UnitedStates, residing at v Beverly, in the county of Essex and State ofMassachusetts, have invented certain Improvements in the Manufacture ofTools, of which the following description, in connection with theaccompanying drawings, is a specification, like reference characters onthe drawings indicating like parts in the several figures.

This invention relates to the marking of tools and particularly steeltools on or in which marks of identification or other significance areimpressed. 1n some'cases, for example rotary cutters used for trimmingthe edges of shoe-soles, the most convenientl if not the only practicallocation for such marks is on or in one of the flat end faces that lieat right angles to the axis. Nearly all if not quite all cutters for thepurpose mentioned have` hubs at their rear ends and it has been commonif not universal practice to apply identification marks such yas thename or initials of the manufacturer, a trademark, or numerals denotingthe size, style vor other distinguishing features by impressing theminto the rear face of `the hub. This location has disadvantages bothfrom the` standpoint of the manufacturer and also from that of the user,and in order'to show just how these disadvantages arise it will be wellto consider the necessary steps in the manufacture of the tools asheretofore practiced.

After a cutter blank has been turned, bored, milled, and otherwisemachined to the desired form, but before it is hardened, impression diesare brought to bear against the end ,of its hub to provide it with thenecessaryv marking while the metal is sufficiently soft to receive theimpressions. After the impressions have been made the cutter is hardenedand then ground to sharpen it and to true its front face so as toprovide a flat seat for the rand-crease guard or shield. The rear end ofthe hub has been chosen for receiving such impressions because it doesnot require grinding and therefore the legi- `bility of the impressionsis unimpaired, but, for reasons hereinafter stated, the radial thicknessof the hubs is so much restricted 221,812.` Divided and this applicationled July 29, No. 399,785. v

This invention provides a new method. ofA

manufacture by which the aforesaid. objections are avoided and by which'anew `and improved cutter is produced. the present application being adivision of `my former ap-r plication Serial No. 221,812, filed March11,

Although, for convenience, the :present invention is describedparticularly with regard to cutters for trimming the ledges of shoesolesits fundamental principles and advantages are applicable to anysteeltool that requires hardening and'grinding vand inwhich it is necessaryor desirable to impressv identification marksi .i Y

n In one respect, therefore, the invention consists in forming a`depression in a face thatyfor any reason will subsequently requiregrinding,` and in impressing the marks on or in the surface forming thedepression so thatIV they will be'below the plane of the ground surfacevand therefore will not be obliterated by the grinding operation.

In' the case. of cutters for the Apurpose stated the front face of `eachcutter must Vbe fiat and lievtrulyat right angles to the axis so as toprovide a suitable seat for the usual shield by which the cutter isprevented from scarring the upper of the shoe. Accordingly, a feature ofthe present invention.v consists in forming ka depression, preferablyanannular, concentric depression, in thefront face of the cutter andthereafter impressing the marks sin or in the surface of. thisdepression so far from the bore that the latter will not ,bedistortedThis not only affords a relatively largey area .for the `impressions butavoids the necessity of the reaming operation hereinbefore mentioned. y

Another feature of the invention consists iii forming the depressionsothat thelshield will cover andl close it and thusl prevent .dust

` fothjatoftheholer The. er

Carreflbr@rotary Shaft- 2l which.V iS driven.. Whilefthejholrl@ 20 .isalso driver the. fronti .gip

The several features of the invention are illustrated by theaccompanying' drawings and are hereinafter described and 'claimed'Referring to the drawings` Fig. l represents a perspective view oi" a.

rotary.4 edge-trimming,cutter embodying; the invention 5 Fig. 2represents such a cutter in section as' being held in the jaws of arotaryholderpbyl which it is rotated in contact with the grinder-in.contacta-with itstfrontdace.; and

Fig. 3 is a section including aportioniofi an edge-trimming machineincluding` such a cutter' assembledwith other-elementsk ot' :welllinownconstruction. in. such machines.

Accordinga` to. .the example. illustrated the cutter comprises.abodyportion l0;v a. hub l1 extendingfto the rear, andteeth l2 havingcutting edges Beforeth'e cutter blankl has been hardened or ground a`depression vis formedin-the front face of-th'eb'ody portion, saiddepressionpreferab-ly beingformedby turning ATso astoh'preserveaccuratef-balance. Thfe'fdfepression-ispreferably-formed rsoVas to l leafvev Va f" concentric`-A annular! langeA 14 contiguous tothe bore for 'sustainingthe shield notches between'theY teeth 1.21rAfter-'this depressionpis formediandgbet'oi-'e the blankA has*been'harden'efdi an-ydesired, words. nu-

meralsV orfothrfsymbols may be impressed in toy th ody '510' yinl thelsurface, forming the depress.ion-.- Figli includes twoV :f rroupsl otsymbols indicated 211316,;k 17. These symbols need not.; beimplresseddeeply, because they lie below the planetowvliich the frontface 0f the utterwll.subsequently be ground- After the vrimpressionsrhave ybeen. made the blank Ina-rfb@ 'Hardened and. then presented to.a. grinder. Such, @what indicated at 18 in Fig; 2M Ashshown bythisigurethelcutter is clamped by jawslg, 19 tornoiripj,parts. ot a" rotaryholder 2Q, the Ytorniations ot lthe cutter andjjawsl being. such. tomaintain the agriso-the cutter in concentric relation facefoflth'egcutttrued towaplauetat right angles to thev axis ofthe cutter. "Ihe-llfnge14 shoulderl l5,

and'teeth 12 are thusngriound-,to a corn-mon.

plane forming a Iseat forthe shield 22 illustratedg iIiE-i'g,k 3,V v

Figo.; qrepr'seuts a fragment 0f an edgetrmmlipgm Thine ot w.ell-k.lmwn`Construction. 11dey .-,a..cutter.s.heft:23a @bearingetthr'e'iof, y.Shield 22, and a Screw 26 for holding the 'deviceA with the cutter.

der 18 is Y beine. thereby ground and' an expansibl'thimble. 21,5ftln-3lparts in assembled relation. The shaft has a tapering portion 27 towhich the thimblc 25 is litted. This thimble fits the bore ot thecutter-and is provided'with a flange 28 arrangedto abut against the rearend of the hub .ot theA cutter.V The shield Q2 has a flat -tacethatlies. against the ground andtrued Atrout tace ot' the cutter and. thatcovers the depression 13 so as to exclude dirt- The shaft is bored andtapped to receive the screw. 26 andfwhen;thelatter is tightened `it notonly clamps the shield against the Afront face of the cutter but forcesthe thimble along` the tapering portion-ottheshai't so thatthe thimbleis expanded vto form a tight coupling betweenthe shaft andthe cutter.

It' has been stated that the hub of the cutter'- is restricted to arelatively small radialidimension. This condition is due in part, atlleast, tothecommon practice of using-some kind ora'.supplementaryY toolor In some casesga eather-edgingdevice is mounted on-the hub of thecutter while in other cases heelbreast-guard--in the form offa ring ismounted on the hub in place offthe feather-edger. Fig. 3 includes brokenlines representing conventionalh7 a feather edger Oof-wellknownconstruction, such device comprisingoperating blades interposed betweenthe teeth yoftheA cutter and a hub or bodv portion 3l bearing on the hubof the cutter. These are. suihcient examples of vthe reason wh)v theradial dimension of the hub ofV the cutter is so much restricted thatthe identiication marks mav notib'e impressed' legiblyy into the hubwithout being so close to the bore as to produce the aforesaiddistorvtion andrequire the aforesaidreaming to correct the distortion.lY Having thus described my invention1 what l claim as new and desire tosecure bv Letters Patent of the United States is: l. That improvement inthe art ot manufacturing cutters which consists in forming a depressionin the end of the cutter, stampmp,` commercial'data in the depression,hardening the cutter and X`grinding the end face.

2. That improvement in` the art of manufacturingcutters which consistsin forming an ai n ul J r depression in the end of ther'cutng ai riby atthembore to support a :stamping emmer-cial data in the dellO nEhardening the. cutter and grindfaoturing rotaryv sole-trimming cuttershav-y ing hubs of relatively small radial dimension projecting from theyrear face of the body portions, which consists in forming a depression.in the front face of the body portion so that a portion of saiddepression will be farther from the center than the rim of the rear endof the hub is, impressing one or more marks in the face forming saiddepression so that some portion of said mark or l marks will be fartherfrom the center than said rim is, hardening the cutter, and grinding thefront face of the body portion so as to true it but not so deeply as totouch the turning a concentric depression in a trans verse face of acutter-blank, impressing one or more marks in said depression While the20 ing machine parts which consists in making 25` a depression ina'bearing surface of a steel part While the steel is soft, impressingone or more marks in the bottom of said depression7 hardening the part,and grinding said bearing surface to true it.

In testimony whereof I have signed my name to this specification.

WILLIAM R. HURD, 2ND.

